Originally posted by FreakyKBH
Here's a little thought experiment for the brain dead masses.
Unless I've overlooked someone, I think it's safe to say no one on this forum has been to the magnetic North Pole, although I'm happy to revise that position if someone can correct it.
That being said, imagine you are a mile south of the pole, facing north.
The needle on your compass will b ...[text shortened]... raight ahead of you.
[b]Q. What does the needle do when you are standing ON magnetic north?[/b]
It is a lot more complex than the simplistic approach you clearly are supposing.
The magnetic field of Earth is mind numbingly complex. The simulations of Earths magnetic field shows it to be twisted around like prezels inside Earth. What that means for Mag north is this: It is not a bunch of field lines shooting out of the ground. What it really is, is bits and pieces of that field fight each other and there will be vectors of force at odds with magnetic north which means on the magnetic north pole there will still be some weaker versions of that field going at right angles to the up and down nature of the field at the poles so the net result is the compass could point the same direction it would a hundred miles away or it could point to an entirely different direction. The gist of that is the usefulness as a compass would be pretty much zero. If the field lines were perfectly aligned and going straight up out of Earth there would be zero net force on a compass held horizontally since the small magnetic field of the compass is more or less horizontal to ground also which is why it interacts with Earths field, the field lines in the compass and the field lines in Earths field are aligned together. If they are 90 degrees out of phase, one field going up and down and the other field going left and right, the interaction between the two will be minumized. Like polarized light, a polarizing filter 90 degrees off from the polarization of light will stop light propagating through the filter. Only when the polarizing filter is away from 90 degrees off the polarized light source does light start to propagate through the filter with max transmission when the two polarized effects are lined up, say light polarized at zero degrees, like straight up and down, and the polarized filter is also in a position of zero degrees, maximum light will get through the filter. It's like that somewhat in the magnetic field of Earth. Except the vectors away from the maximum torque effect of the compass may still allow a decent reading since it doesn't take much to move the compass needle which is mounted on a point source bearing. So at mag north there would probably still be readings but unreliable since Earths field is not a solid uniform nature, it is very chaotic and mag north moves around slowly and magnetic compasses used for navigation need to be updated about every 10 years or so.
The thing about that, you may think I am talking out my ass about this but that was one of the things discussed at length during my year of electronics training when I was in the USAF, my job 'Bomb Nav mechanic' which included magnetic compass, airborne radar, and navigational computers. 4 years of that.
But given your MO, none of that will mean anything to you since you are very transparent and only wish to further you flass BS and nothing more. You clearly could care less about the actual science of magnetic fields, especially Earth's field.
If for some bizarre reason you are actually interested in what we actually know about Earth's field, go to this link and the image in the upper right corner shows the complexity of that field and you may notice some of the lines right on the north pole are going at right angles to Earth's surface instead of going straight up and down as the simplistic assumptions about that field are talked about:
It shows what field lines would look like during the beginnings of the periodic polarity reversals of field lines. The fields of the north change from say going straight up and out the surface to going straight down and INTO the surface, where what we might call the north as a north pole of a magnet actually becomes a literal south pole and at the south pole THAT pole becomes a north pole for the time between field line reversals.